Hydrophilic/Hydrophobic Contrast Effect of O2 Plasma Treatment to Film Substrates 


Vol. 50,  No. 4, pp. 266-274, Aug.  2013
10.12772/TSE.2013.50.266


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  Abstract

We studied the effects of O2 plasma on the hydrophilic/hydrophobic contrast of film substrates. PET (polyethylene terephthalate) and FEP (fluorinated ethylene propylene) films were treated by O2 plasma, and the surface of the films was investigated using atomic force microscopy(AFM), X-ray photoelectron spectroscopy (XPS), and contact-angle and surface energy measurements. Surface energies were calculated from the measured contact angles between several solutions and the films based on the geometric mean and Lewis acid-base method. The contact angle of PET films treated by O2 plasma decreased with increasing treatment time in water and surfactant solution, and surface energy increased with increasing polar component of surface tension of the film. In contrast, the contact angle of the O2 plasma-treated FEP film decreased, and surface energy decreased with decreasing nonpolar component of surface tension of the film.

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